Ubuntu is a Linux distribution based on Debian and developed by Canonical.
Official documentation can be found at https://help.ubuntu.com/.
Ubuntu Desktop
Installation
Help Wanted
This section needs additional guidance.
Use the Official Ubuntu Documentation page to find the official installation guide for the version and platform you desire to install. For example, the installation guide for 18.04 of amd64 is here.
Kubuntu
Installation
See Kubuntu Help and Support. Download and use the PDF for the desired version.
Disabling auto update
APT::Periodic::Update-Package-Lists "0"; APT::Periodic::Unattended-Upgrade "0";
Package Management
Switching version of major packages
Use update-alternatives --config java
Fixing broken packages
Sometime you will get an error like: E: Unable to correct problems, you have held broken packages.
To solve, you can try installing aptitude and trying aptitude install <package>
The aptitude utility has more powerful conflict resolution abilities.
See issue: https://askubuntu.com/a/451078
Listing installed packages
apt list --installed > installed.txt
Open and Ctrl+F in text editor